-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian Security Advisory DSA-4082-1 security@xxxxxxxxxx https://www.debian.org/security/ Salvatore Bonaccorso January 09, 2018 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : linux CVE ID : CVE-2017-5754 CVE-2017-8824 CVE-2017-15868 CVE-2017-16538 CVE-2017-16939 CVE-2017-17448 CVE-2017-17449 CVE-2017-17450 CVE-2017-17558 CVE-2017-17741 CVE-2017-17805 CVE-2017-17806 CVE-2017-17807 CVE-2017-1000407 CVE-2017-1000410 Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. CVE-2017-5754 Multiple researchers have discovered a vulnerability in Intel processors, enabling an attacker controlling an unprivileged process to read memory from arbitrary addresses, including from the kernel and all other processes running on the system. This specific attack has been named Meltdown and is addressed in the Linux kernel for the Intel x86-64 architecture by a patch set named Kernel Page Table Isolation, enforcing a near complete separation of the kernel and userspace address maps and preventing the attack. This solution might have a performance impact, and can be disabled at boot time by passing `pti=off' to the kernel command line. CVE-2017-8824 Mohamed Ghannam discovered that the DCCP implementation did not correctly manage resources when a socket is disconnected and reconnected, potentially leading to a use-after-free. A local user could use this for denial of service (crash or data corruption) or possibly for privilege escalation. On systems that do not already have the dccp module loaded, this can be mitigated by disabling it: echo >> /etc/modprobe.d/disable-dccp.conf install dccp false CVE-2017-15868 Al Viro found that the Bluebooth Network Encapsulation Protocol (BNEP) implementation did not validate the type of the second socket passed to the BNEPCONNADD ioctl(), which could lead to memory corruption. A local user with the CAP_NET_ADMIN capability can use this for denial of service (crash or data corruption) or possibly for privilege escalation. CVE-2017-16538 Andrey Konovalov reported that the dvb-usb-lmedm04 media driver did not correctly handle some error conditions during initialisation. A physically present user with a specially designed USB device can use this to cause a denial of service (crash). CVE-2017-16939 Mohamed Ghannam reported (through Beyond Security's SecuriTeam Secure Disclosure program) that the IPsec (xfrm) implementation did not correctly handle some failure cases when dumping policy information through netlink. A local user with the CAP_NET_ADMIN capability can use this for denial of service (crash or data corruption) or possibly for privilege escalation. CVE-2017-17448 Kevin Cernekee discovered that the netfilter subsystem allowed users with the CAP_NET_ADMIN capability in any user namespace, not just the root namespace, to enable and disable connection tracking helpers. This could lead to denial of service, violation of network security policy, or have other impact. CVE-2017-17449 Kevin Cernekee discovered that the netlink subsystem allowed users with the CAP_NET_ADMIN capability in any user namespace to monitor netlink traffic in all net namespaces, not just those owned by that user namespace. This could lead to exposure of sensitive information. CVE-2017-17450 Kevin Cernekee discovered that the xt_osf module allowed users with the CAP_NET_ADMIN capability in any user namespace to modify the global OS fingerprint list. CVE-2017-17558 Andrey Konovalov reported that that USB core did not correctly handle some error conditions during initialisation. A physically present user with a specially designed USB device can use this to cause a denial of service (crash or memory corruption), or possibly for privilege escalation. CVE-2017-17741 Dmitry Vyukov reported that the KVM implementation for x86 would over-read data from memory when emulating an MMIO write if the kvm_mmio tracepoint was enabled. A guest virtual machine might be able to use this to cause a denial of service (crash). CVE-2017-17805 Dmitry Vyukov reported that the KVM implementation for x86 would over-read data from memory when emulating an MMIO write if the kvm_mmio tracepoint was enabled. A guest virtual machine might be able to use this to cause a denial of service (crash). CVE-2017-17806 It was discovered that the HMAC implementation could be used with an underlying hash algorithm that requires a key, which was not intended. A local user could use this to cause a denial of service (crash or memory corruption), or possibly for privilege escalation. CVE-2017-17807 Eric Biggers discovered that the KEYS subsystem lacked a check for write permission when adding keys to a process's default keyring. A local user could use this to cause a denial of service or to obtain sensitive information. CVE-2017-1000407 Andrew Honig reported that the KVM implementation for Intel processors allowed direct access to host I/O port 0x80, which is not generally safe. On some systems this allows a guest VM to cause a denial of service (crash) of the host. CVE-2017-1000410 Ben Seri reported that the Bluetooth subsystem did not correctly handle short EFS information elements in L2CAP messages. An attacker able to communicate over Bluetooth could use this to obtain sensitive information from the kernel. For the oldstable distribution (jessie), these problems have been fixed in version 3.16.51-3+deb8u1. We recommend that you upgrade your linux packages. For the detailed security status of linux please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@xxxxxxxxxxxxxxxx -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEERkRAmAjBceBVMd3uBUy48xNDz0QFAlpU5cRfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDQ2 NDQ0MDk4MDhDMTcxRTA1NTMxRERFRTA1NENCOEYzMTM0M0NGNDQACgkQBUy48xND z0Qsnw//euNWKwOR4R+JFEyKECrS5GHFzLdj1kpion3oGGZyyJ8VjmVv+MombQPk xk17ge5QWl44CMzXlkE6QREdrXQfed49us9O6CzS2BPwV/QWsoUc7WLmqYD0OQmh c5/RqvkzUfXzEJ7efLzChXAs94RB0A9kOKoRxNrXfdhvevM+FumB17dErIrT2nxP KcX3Tyh05twrJqCnbNIo189LDexKfEyAN9pnwBekknzXB0V3zmvPwebVz85v1I8p aiWSXX9EjWvVeZG31XDOysEcrwO4T71zqCgPxPeurAOVTJNvK0B8je7wFBD9ayoy PFNdykxRUBA9rBJ8Aoi3zcZBJYxTYBzOKDUkPaO/80mflsN6yDCaWwQ+antyuQ8y jO02bAEZiKmpsuclKvK48rfvtoFqXsp6WhO1NoWnmpFvsxXN0DdqKRB60rycrMMA Q2wLYnPX2QNRNdxtkJ0D380VkTdPjJT4yOPM4UuIJ1S7jwzVcQKnu8VswdFey0nq k42DigyVQryZd1elqiyGWWtNkJ9BRscSgkpCAfEUo2XCR61wEXu7aOHGksPuTTZr 2FJGIa4OR1dAc2pPGy7CUWYnloGwSCCq7F85bi6v5KG7YnHlic/XnJva+hT+0lGT 1HQlCKU9bicaLL0GIK9Qt5vaUseZLWiOXMHU6JKvo/y6AL3FHnI= =Ozoc -----END PGP SIGNATURE-----
